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Assessment of Open Probability of the Mitochondrial Permeability Transition Pore in the Setting of Coenzyme Q Excess
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Mitochondrial GSDMD Pores DAMPen Pyroptosis

Katherine C Barnett1, Jenny P-Y Ting1

  • 1University of North Carolina, Chapel Hill, Chapel Hill, NC, USA.

Immunity
|March 19, 2020
PubMed

Insights

Cytosolic lipopolysaccharide (LPS) typically causes cell death. However, Huang et al. found that in endothelial cells, LPS restrains proliferation instead of causing pyroptosis.

Area of Science:

  • Immunology
  • Cell Biology
  • Vascular Biology

Background:

  • Noncanonical inflammasome activation by cytosolic lipopolysaccharide (LPS) leads to pyroptotic cell death.
  • Gasdermin D (GSDMD) pore formation is a key mediator of this cell death pathway.

Purpose of the Study:

  • To investigate the effect of cytosolic LPS on endothelial cells.
  • To determine if endothelial cells undergo pyroptosis or exhibit a different response to cytosolic LPS.

Main Methods:

  • Endothelial cells were treated with cytosolic LPS.
  • Cell proliferation and cell death assays were performed.
  • Inflammasome activation and GSDMD processing were analyzed.

Main Results:

  • Cytosolic LPS in endothelial cells did not induce pyroptotic cell death.
  • Instead, cytosolic LPS was found to restrain endothelial cell proliferation.
  • The study elucidated a novel role for LPS in regulating endothelial cell behavior.

Conclusions:

  • Endothelial cells exhibit a unique response to cytosolic LPS, characterized by proliferation restraint rather than cell death.
  • This finding challenges the conventional understanding of LPS-induced inflammasome activation and its cellular outcomes.
  • The results highlight the context-dependent nature of inflammatory signaling in vascular cells.

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